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Saturday, 31 October

JEE Main · Physics · Thermal Properties of Matter

Junction Temperature

JEE Main asked Junction Temperature 6 times in 6 of the 108 shifts Lumi analysed, in 2021, 2022, 2023 and 2025. It belongs to Heat Conduction, in Thermal Properties of Matter (Physics). The longest wait between two years asking it was 2 years. In 2021 and 2022 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
6
in 6 shifts
Years
4 of 8
First asked
2021
last in 2025
Pattern
Comes in cycles
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2021, 2022, 2023 and 2025. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.

00.10.20’170’200.07’210.07’220.07’230’240.13’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 2 in 24 shifts · 2022: 2 in 24 shifts · 2023: 1 in 12 shifts · 2024: 0 in 18 shifts · 2025: 1 in 8 shifts · 2026: 0 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20260 of 9
  • 20251 of 8
  • 20240 of 18
  • 20231 of 12
  • 20222 of 24
  • 20212 of 24
  • 20200 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Numerical value is the usual form. Skill tested: calculation.

  • Interface temperature of two rods
  • Contact temperature of two slabs

Difficulty

Easy 2Medium 4Hard 0

3 of the 6 questions had a numerical answer.

Every question

All 6 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  1. 7 Apr 2025, Shift 2 · Q47Two cylindrical rods A and B made of different materials, are joined in a straight line. The ratios of lengths, radii and thermal…MediumNumerical value
  2. 13 Apr 2023, Shift 2 · Q53Two plates A and B have thermal conductivities 84 Wm−1K−184\ \mathrm{Wm^{-1}K^{-1}} and 126 Wm−1K−1126\ \mathrm{Wm^{-1}K^{-1}} respectively. They have same…EasyNumerical value
  3. 24 Jun 2022, Shift 1 · Q50Two metallic blocks M1M_1 and M2M_2 of same area of cross-section are connected to each other (as shown in figure). If the thermal…MediumSingle correctHas a figure
  4. 27 Jul 2022, Shift 1 · Q37If K1K_1 and K2K_2 are the thermal conductivities, L1L_1 and L2L_2 are the lengths and A1A_1 and A2A_2 are the cross sectional areas of…MediumSingle correctHas a figure
  5. 26 Feb 2021, Shift 1 · Q9The temperature θ\theta at the junction of two insulating sheets, having thermal resistances R1\mathrm{R_1} and R2\mathrm{R_2} as well as…EasyDiagram basedHas a figure
  6. 27 Aug 2021, Shift 1 · Q30A rod CD of thermal resistance 10.0 KW−1^{-1} is joined at the middle of an identical rod AB as shown in figure. The ends A, B and D are…MediumNumerical valueHas a figure

Shifts: 26 Feb 2021, Shift 1, 27 Aug 2021, Shift 1, 24 Jun 2022, Shift 1, 27 Jul 2022, Shift 1, 13 Apr 2023, Shift 2, 7 Apr 2025, Shift 2.

Same topic

Other ideas in Heat Conduction

Heat Conduction has 6 ideas JEE Main has asked; 1 of them came up in more than one question.

Topic analysisChapter analysisStudy this chapterAll repeated ideas